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1. Mega-Extensive Telecommunications Applications Language.
BBS language for PRODOS 8 on Apple II.
2. The syntax-definition formalism of the Mentor system.
Metal specifications are compiled to specifications for a
scanner/parser generator such as Lex/Yacc. "Metal: A
Formalism to Specify Formalisms", G. Kahn et al, Sci Comp
Prog 3:151-188 (1983).